In the case of my HP ProDesk 600 G1 SFF PC system, page 18 of HP's QuickSpecs document notes that 1920 x 1200 is supported only on displays connected to the external DisplayPort connector. I solved my problem by buying a PCIe x16 card (MSI P/N N8400GS-MD1GD3H/LP, $35.69 plus tax on EBay). With the Low Profile bracket attached, the card uses 3 of the PC's 4 back panel slots.
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